Remove nimble examples following the deprecation of the service.

[jonathan343]

After the merge of https://github.com/boto/botocore/pull/3280, we can remove the nimble examples here as the client will no longer be functional.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 0.08%. Comparing base (f70e1e3) to head (5449163). Report is 101 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #8981      +/-   ##
==========================================
- Coverage     0.08%   0.08%   -0.01%     
==========================================
  Files          210     210              
  Lines        16902   16954      +52     
==========================================
  Hits            14      14              
- Misses       16888   16940      +52     

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